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Demco A-Frame Couplers
Demco Brake Actuator Couplers

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Expert Answers about Demco

  • How To Check if Trailer Surge Brakes Are Working Properly On Tandem Axle Boat Trailer
  • Checking the brakes can be done in two ways. The easiest way is to raise one side of the trailer and spin the wheels while someone applies the surge brakes at the coupler. The better way would be to remove each of the wheels and brake drums and activate the brakes while making sure the wheel cylinders and brake assemblies are functioning properly. After this the first thing I would do is bleed the brakes using the trailers surge coupler to force the fluid from the brake lines and make...
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  • Recommendation for Installation of a Brake Mounting Flange on a Trailer Spindle and Axle
  • Welding a mounting flange, possible item # 4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear, improper braking, trailer dog legging, bearing failure, rapid tire wear and, worst of all, weakening of the axle can occur. Usually special jigs are used to install the flange. The jig will keep the flange square and concentric to the axle and...
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  • Can Lock Out Solenoid Be Added to Demco Hydraulic Brake Actuator
  • I spoke with my contact at Demco regarding the Hydraulic Brake Actuator # DM8759122 referenced in your question. He stated that the Demco Solenoid Kit # DM5404 can indeed be used with this actuator so the trailer brakes do not activate when shifting into reverse This has a gross towing weight capacity of 8,000 pounds and will mount to straight, 3 inch wide trailer tongues. I have attached a short video demonstration on this product for you to check out.
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  • Recommended Replacement Hydraulic Brakes with 10-Inch Diameter for a Boat Trailer?
  • Knowing the inside diameter of the drum is the key piece of information we need; the brand of the assembly will not be a factor in determining what you will need to replace your hydraulic brakes. You mentioned your trailer's GVW, but it is the trailer's axle weight capacity which determines the size of the brake assembly you are going to need. For example, a drum with a 10-inch diameter like yours fits brake assemblies for a 3,500 lbs axle. For your boat trailer, I recommend the Demco...
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  • Fit of Demco # DM8104311 Hydraulic Brake Actuator
  • The Demco # DM8104311 is compatible with 3 inch wide straight trailer tongues. You can see our return policy by clicking the provided link.
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  • Difference Between Demco Hydraulic Trailer Brake Actuator DA66B # 8605001 and Previous DA66 Model
  • I spoke with my contact at Demco and he said that there really is no difference between Demco Hydraulic Trailer Brake Actuator DA66B, # 8605001, and the DA66 that you have on your trailer. They just did a name change.
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  • What are the Correct Replacement Wheel Cylinders for Demco Hydraulic Trailer Brakes # 40716
  • If you have Redline brakes (part # 40716 is actually Demco), then you will need to use Redline Wheel Cylinder, # BP17-030 (left) and # BP17-020 (right). The correct replacement wheel cylinder for your hydraulic trailer brake assemblies is determined by the brand and size of brake assembly that is on your trailer.
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  • Removing Surge Coupler-Actuated Brakes from Mc Clain Boat Trailer
  • If you want to deactivate the hydraulic brakes on your boat trailer, you can certainly do so. The simplest way to do this would be to drain the brake fluid from the lines by disconnecting the brake lines from the wheel cylinders and allowing the fluid to drain. You'd then immobilize the articulating portion of the coupler by drilling holes in either side and sliding a bolt through to prevent the coupler from compressing. A better long term option would be to remove the coupler and replace...
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  • What Braking Assemblies do I Need for Karavan Tandem Axle
  • If the bolt pattern on your axles, for the backing plate, is 2-3/4 inch on center , both of these braking assemblies would fit your 10 inch x 2-1/4 inch trailer brake assemblies. Part # 40715 and # 40716 are what I would recommend. These are the left and right hand side brake assemblies. Since you are going to be backing up an incline you want the least amount of reverse braking which is why I recommend these over the other. The shoes for these assemblies are part # BP04-126. The...
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  • Hydraulic Disc or Drum Trailer Brakes for 10 Inch Wheels
  • We have several options for trailer brakes that will fit a 10 inch wheel. For a 10 inch wheel you will need a 8-1/2 inch hub and drum assembly such as # T1544500042 which has a 5 on 4-1/2 bolt pattern. Then for hydraulic drum brakes we have just one option, # T4442000 for the right side and # T4442100 for the left side. These are designed for 3,000 pound axles. For disc brakes we have the following options: For 2,000 pound axles we have # K2HR2D or # K2HR2E. For 3,500 pound axles...
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  • Above Bed Base Rails and Install Brackets for Older Hijacker 5th Wheel Hitch on 2005 Ford F-150
  • I spoke with my contact at Demco about the hitch part number you provided in order to find the correct base rails to install in your 2005 Ford F-150. The FWH 24PA is the part number for the hitch head that fit older Hijacker 5th wheel hitches. My contact at Demco confirmed that these hitches do not fit in Industry Standard Rails and require a particular rail kit, the Replacement Rails for Demco Hijacker 5th Wheel Trailer Hitch, Older Models # DM6014. These above bed rails are designed...
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  • Would Demco Brake Actuator part # 8605001 Replace Atwood Actuator Stamped # 61101
  • The number 61101 isn't actually a part number, but from a different question we answered here we were able to determine that the part number you are looking for that your couple would have is 82543. Which our part number for that would be # AT82543. This would be an exact replacement for what you have. Or, the part # 8605001 that you referenced would work as well since it also has it's mounting holes 3 inches apart.
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  • Availability of 12.5k Rated A-Frame Surge Brake Coupler
  • Yes we have the Demco # DM8102222 for if you have drum brakes or the part # DM8105422 for if you have disc. These have channels on the front so you would need the ball coupler part # DM05557-97 to connect to a 2-5/16 inch hitch ball.
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  • Troubleshooting Surge Brakes Locking up When in Reverse
  • With surge brakes, you have a brake actuator applying the needed pressure to the brakes but to be able to back up you will need to have a manual lockout or an electric lockout solenoid, like # T4748800, which will close when you shift the vehicle into reverse, allowing the trailer to be backed up. You may also need a solenoid cover like the Titan # T4835800183, depending on what brake actuator you currently have. Typically surge brakes are found on boat trailers, and commonly the...
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  • Recommended Brakes For Boat Trailer With Surge Coupler And 3500-Lb Axle
  • There are quite a few brake assemblies that will work with your EZloader trailer. It helps when you give the information you provided when choosing a system. I recommend using free-backing brakes like the Demco Brakes. For the left hand(driver side) you would need part # 40716 and for the right hand I recommend part # 40715. These do not engage when backing up so they are great for a boat trailer. These brakes do have a 4-bolt brake flange.
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  • Determining If Surge Brake Actuator Has Lockout or If Brakes are Free-Backing
  • The only way to turn a surge brake actuator "off" is to engage a lockout on the actuator. Some actuators have manual lockouts, others have electric lockouts, and some have no way to lock out the actuator. Typically, free-backing brakes are used with actuators that have no lockout. As long as the trailer brakes engaging when your tow vehicle is stopping, the brakes are working correctly. I have attached photos showing a manual lockout and electric lockout to help you determine if your...
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  • Base Rails and Brackets Needed to Install the Older Demco Hijacker FWH24PA in a 2017 Ram 2500
  • I have the perfect solution for you to be able to use the older Demco Hijacker FWH24PA 5th wheel hitch in the bed of your 2017 Ram 2500 with a short bed provided that your truck bed does not already have the factory pucks or any other hitch already installed. The bed rails that are compatible with the Demco Hijacker FWH24PA are listed as part # DM6014 on our site and can be used with the Demco Hijacker Premier Series Custom Mounting Brackets # DM8552025 that are confirmed to fit your...
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  • Coupler Lock Recommendation for Use with Demco Channel Tongue Trailer Coupler
  • Yes the coupler part # DM13689-52 that you referenced is lockable. For a pin style lock the part # 28012 would work well. Or for a lock that goes around the coupler opening the part # DT25013 would be a great option. I attached review videos for both locks.
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  • How to Bleed Trailer Surge Brakes
  • I attached a video that details how to bleed surge brake actuators for you to check out. First top off the master cylinder with appropriate fluid. Next you will want to pump the fluid from the master cylinder. You can do this by unbolting the plate that holds the lever in place and then use that lever to actuate the master cylinder and force the fluid through. On some units, you will have to manually activate it at the point where the hitch ball moves in and out. The model in the video...
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  • Manual Reverse Lockout for Demco D91 Trailer Brake Actuators
  • Yes! The manual reverse lockout kit you are looking for is the # DM5939 for D91 Demco Hydraulic Trailer Brake Actuators. I have linked the product and installation instructions to this page for your convenience.
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  • Can Weld-On A-Frame Trailer Coupler be Replaced with a Bolt-On Coupler
  • Yes, you can replace your weld-on coupler with a bolt-on. You'll just need to drill the holes. Then, if you wanted to go back to a weld-on later that would be fine too. Just to confirm you can check with the trailer's manufacturer that drilling the holes won't lower the trailer's capacity. Our most popular A-frame couplers are the Demco eZ-Latch. The eZ-Latch makes it easier to hookup and disconnect from your trailer. For a coupler that fits a 2 inch ball use # DM14793-52 and...
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  • Can a Weld-On A-Frame Trailer Coupler be Bolted On Instead of Welded
  • The A-frame couplers we carry, like # 12660-97SP, are weld-on applications and cannot be bolted on to a trailer frame. Any welding should be done by a qualified welder in a shop that works on trailers. The coupler you have reference accepts a 2-5/16 inch diameter ball. I have included a link to all of the A-frame coupler options for you to view.
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  • Mounting Drum Brakes to an EZ-Loader Trailer with 4-Bolt Brake Mounting Flange
  • If you are wanting to install your brakes on your EZ-Loader trailer, you will need brake mounting flanges with a 4 bolt pattern that matches the bolt pattern of your brake assemblies. We do carry some brake mounting flanges, but we will need to know the diameter of your axle or spindle shaft to determine if we have a brake mounting flange that will fit your trailer. The brake mounting flanges will need to be welded on square, so we recommend having a qualified professional with trailer...
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  • How to Determine if Trailer Has Reverse Lock Out When Picking Out Brake Assemblies
  • Is there a solenoid screwed in to the back of the master cylinder on the trailer? Or is there a lever on the actuator that you move whenever you need to be able to back the trailer up? If so, then you have a reverse lock out. I attached a link to a page that has all of the hydraulic assemblies we carry. If you need free-backing plates there is a filter on the page that you can select that will take you to a page that has all of the free-backing assemblies we carry. You also will want...
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  • When Replacing Trailer Brake Lines Is Bleeding the System Required to Get Fluid to Assemblies
  • You will need to bleed the brake system to get all of the air out of the lines after replacing the brake lines. Filling up the master cylinder will get some fluid into the lines but not a whole lot. You will need to keep bleeding them till there are no air bubbles that come of the wheel cylinders. If you have a power bleeder you would not need to actuate the actuator to build pressure as the power bleeder will do that for you. To make bleeding the brakes easier and quicker we have...
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  • Can Free-Backing Brakes Replace Non-Free-Backing Breaks on 2001 EZ Loader Boat Trailer
  • You can use free-backing brake assemblies on your trailer in place of the existing non-free-backing brakes. For your 2001 EZ Loader boat trailer I recommend the Demco Hydraulic Drum Brake Assemly, Free Backing, Galvanized, for 10 Inch Brakes # 40715 for the right- hand side and # 40716 for the left-hand side. The galvanized steel will resist rust, making these assemblies great for your boat trailer. I have attached an installation video of these brakes for you. Another great option is...
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  • What Is The Mounting Dimension For Demco A-Frame Trailer Coupler # DM14793-95
  • The Demco A-Frame Trailer Coupler # DM14793-95 is designed for standard A-frame trailers which is 50 degrees as you mentioned. I confirmed this with my contact at Demco. This is a 10,000-lb coupler and it is designed for a 2-inch hitch ball.
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  • Why Do Demco Hydraulic Brake Assemblies Have Brake Linings Riveted to the Brake Shoes
  • Riveting the linings on brake shoes on hydraulic brake assemblies was historically the industry standard, while electric brake assemblies typically have the pads glued or bonded into place. All Demco could tell me is that they rivet all of their brake linings. I also spoke with folks at Dexter. I was told that in the past the adhesives used to bond the linings on the shoes were unable to withstand harsh marine environments. If water should penetrate between the shoe and the lining, rust...
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  • Parts Needed to Replace Brakes, Brake Lines and Actuator on Tandem Axle Boat Trailer
  • We have everything that you will need to replace the brakes, brake lines and the actuator on your tandem axle boat trailer, but to make sure we recommend the correct parts for your trailer, we will need a little more information. For a brake line kit, I recommend the Demco Hydraulic Brake Line Kit for Tandem Axle Trailers, # DM5428. This is our most economical hydraulic brake line kit and it uses the standard brake line fittings, so it will be compatible with all hydraulic brake assemblies...
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  • Coupler Lock for Demco Channel Tongue Trailer Coupler # DM13203-52
  • You can use the DeadBolt BLOCKHEAD Trailer Coupler Lock # TCL3-AS if you are looking to keep your trailer from being coupled to. If you are looking for a lock that prevents it from being uncoupled then that would be the DeadBolt part # 28012. Either of these are great options to help secure your trailer with the Demco Channel Tongue Trailer Coupler # DM13203-52 and deter theft.
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